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X=P/AB
R=ax:b /*b
Rb=ax / a
x=Rb/a
S=A:BX / * BX
SBX=A / SB
X=A/SB
T=1:abx / * abx
Tabx=1 / Tab
x=1/Tab
Y=2T-3X
Y-2T=-3X / -3
X=Y-2T/-3
X= P:AB
b) R=ax:b /:a
R:a=x:b /:b
R:a:b=x
c) S=A:BX / : A
S:A=BX / :B
S:A:B=X
d) T=1:abx / :(1:ab)
T:(1:ab)=x
e) Y=2T-3X / :3
1/3Y=2/3T-X /:2/3T
1/3Y:2/3T= X